<template>
	<view class="tui-charts__pie-wrap" :class="{'tui-charts__pie-vertical':legend.direction!=='vertical'}">
		<view class="tui-pie__legend" :class="{'tui-legend__flex-column':legend.direction==='vertical'}"
			v-if="legend.show">
			<view class="tui-pie__legend-item" :style="{marginLeft:legend.direction==='vertical'?'0':'24rpx'}" v-for="(item,index) in dataset" :key="index">
				<view class="tui-legend__circle" :style="{backgroundColor:item.color}"></view>
				<text
					:style="{fontSize:(legend.size || 24)+'rpx',lineHeight:(legend.size || 24)+'rpx',color:legend.color || '#333'}">{{item.name}}</text>
			</view>
		</view>
		<view class="tui-charts__pie-box" :style="{width:diam+'rpx',height:diam+'rpx',backgroundColor:backgroundColor}">
			<view class="tui-charts__pie-itembox"
				:style="{width:diam/2+2+'rpx',height:diam+'rpx',backgroundColor:item.angle>180?item.color:'transparent',zIndex:item.angle>180?10:'auto',clip:item.transformAngle>180?`rect(0, ${diam/2}rpx, ${diam}rpx, 0)`:'auto'}"
				v-for="(item,index) in dataset" :key="index" @tap.stop="itemClick(index)">
				<view class="tui-charts__pie-item"
					:style="{width:diam/2+'rpx',height:diam+'rpx',marginLeft:diam/2+'rpx','-webkit-transform': `rotate(${item.transformAngle}deg)`,'transform': `rotate(${item.transformAngle}deg)`,backgroundColor:item.color}">
				</view>
			</view>
			<view class="tui-charts__pie-annular" v-if="type==2"
				:style="{width:annular.width+'rpx',height:annular.width+'rpx',backgroundColor:annular.backgroundColor}">
			</view>
		</view>
		<view class="tui-pie__tooltip" v-if="tooltip" :class="{'tui-pie__tooltip-show':tooltipShow}">
			<view class="tui-tooltip__title" v-if="title">{{title}}</view>
			<view class="tui-pie__tooltip-item" :style="{paddingTop:title?'24rpx':'0'}">
				<view class="tui-legend__circle"
					:style="{backgroundColor:dataset[activeIndex] && dataset[activeIndex].color}"></view>
				<text class="tui-tooltip__val">{{dataset[activeIndex] && dataset[activeIndex].name}}</text>
				<text
					class="tui-tooltip__val tui-tooltip__val-ml">{{dataset[activeIndex] && dataset[activeIndex].value}}</text>
			</view>
		</view>
	</view>
</template>

<script>
	export default {
		name: "tui-charts-pie",
		props: {
			//统计名称
			title: {
				type: String,
				default: ''
			},
			//饼状图直径 rpx
			diam: {
				type: Number,
				default: 400
			},
			//饼状图背景色
			backgroundColor: {
				type: String,
				default: 'transparent'
			},
			//图例，说明
			legend: {
				type: Object,
				default () {
					return {
						show: true,
						size: 24,
						color: '#333',
						//horizontal，vertical
						direction: 'horizontal'
					}
				}
			},
			tooltip: {
				type: Boolean,
				default: true
			},
			//展示类型：1-饼状 2-环状
			type: {
				type: Number,
				default: 1
			},
			//环形中间圆圈样式
			annular: {
				type: Object,
				default () {
					return {
						width: 200,
						backgroundColor: '#f8f8f8'
					}
				}
			}
		},
		beforeDestroy() {
			this.clearTimer()
		},
		data() {
			return {
				tooltips: [],
				tooltipShow: false,
				timer: null,
				activeIndex: -1,
				/*========options============*/
				/*
				    value:0, 
					name: '', 
					color: ''
				*/
				dataset: []
			};
		},
		methods: {
			getTotalVal(data) {
				let val = 0;
				data.forEach((item, index) => {
					val += item.value;
				})
				return val;
			},
			init(dataset) {
				let data = [...dataset]
				const total = this.getTotalVal(data);
				let totalAngle = 0;
				data.map((item, index) => {
					item.transformAngle = totalAngle;
					item.angle = Number((item.value / total * 360).toFixed(1))
					totalAngle += item.angle
				})
				this.dataset = data;
			},
			draw(dataset) {
				this.init(dataset)
			},
			clearTimer() {
				clearTimeout(this.timer)
				this.timer = null;
			},
			itemClick(index) {
				this.activeIndex = index;
				this.clearTimer()
				this.tooltipShow = true;
				this.timer = setTimeout(() => {
					this.tooltipShow = false
				}, 5000)
				this.$emit('click', {
					index: index,
					...this.dataset[index]
				})
			}
		}
	}
</script>

<style scoped>
	.tui-charts__pie-wrap {
		position: relative;
		display: inline-flex;
		align-items: center;

	}

	.tui-charts__pie-vertical {
		flex-direction: column;
	}

	.tui-pie__legend {
		display: flex;
		align-items: center;
		flex-wrap: wrap;
	}

	.tui-legend__flex-column {
		flex-direction: column;
		margin-right: 40rpx;
	}

	.tui-pie__legend-item {
		display: flex;
		align-items: center;
		margin-bottom: 40rpx;
	}

	.tui-legend__circle {
		height: 20rpx;
		width: 20rpx;
		border-radius: 50%;
		margin-right: 8rpx;
		flex-shrink: 0;
	}

	.tui-charts__pie-box {
		position: relative;
		border-radius: 50%;
		overflow: hidden;
		transform: rotate(0deg);
		flex-shrink: 0;
		font-size: 0;
	}

	.tui-charts__pie-itembox {
		position: absolute;
		left: 0;
		top: 0;
		/* #ifdef H5 */
		cursor: pointer;
		/* #endif */
	}

	.tui-charts__pie-item {
		transform-origin: 0 50%;
		/* #ifdef H5 */
		cursor: pointer;
		/* #endif */
		position: relative;
		z-index: 10;
		margin-top: 0;
		margin-bottom: 0;
		margin-right: 0;
		/* transform-style:preserve-3d; */
		/* transition: all 0.3s; */
	}

	.tui-charts__pie-annular {
		border-radius: 50%;
		left: 50%;
		top: 50%;
		position: absolute;
		z-index: 12;
		transform: translate(-50%, -50%);
		display: flex;
		align-items: center;
		justify-content: center;
	}

	.tui-pie__tooltip {
		padding: 30rpx;
		border-radius: 12rpx;
		background-color: rgba(0, 0, 0, .6);
		display: inline-block;
		position: absolute;
		top: 50%;
		left: 50%;
		transform: translate(-50%, -50%);
		z-index: 20;
		visibility: hidden;
		opacity: 0;
		transition: all 0.3s;
	}

	.tui-pie__tooltip-show {
		visibility: visible;
		opacity: 1;
	}

	.tui-tooltip__title {
		font-size: 30rpx;
		color: #fff;
		line-height: 30rpx;
		flex-shrink: 0;
	}

	.tui-pie__tooltip-item {
		display: flex;
		align-items: center;
		white-space: nowrap;
	}

	.tui-tooltip__val {
		font-size: 24rpx;
		line-height: 24rpx;
		color: #fff;
		margin-left: 6rpx;
		white-space: nowrap;
	}

	.tui-tooltip__val-ml {
		margin-left: 20rpx;
	}
</style>
